When John Lamothe first learned that Aaron Hernandez was under investigation for a murder, he was crushed. Lamothe, who lives in Florida, is a huge Patriots fan, and he especially liked Hernandez because they had gone to the same school, the University of Florida. But when the sordid details about the case piled on by the day, Lamothe looked at the Number 81 Aaron Hernandez Patriots jersey in his house and knew he wanted it gone. “I thought about giving it to Goodwill,” he said, “but I didn’t think anybody would want it.” So instead, he put it on eBay, the online auction site. “I thought I might get $15 for it,” he said. On Sunday, it sold for $289. The New England Patriots have cut Hernandez, who was arrested last Wednesday and charged with murder in the death of Odin Lloyd, and cleared any Hernandez-related memorabilia from store shelves. And this weekend, the Patriots ProShop at Gillette Stadium will offer fans who bought a Hernandez jersey at the store the chance to exchange it for another player’s. But online, a market for Hernandez memorabilia has emerged. One man on Craigslist is offering to buy “anything” related to Hernandez , who has pleaded not guilty to the charges. On eBay, heavy bidding is often driving prices for items well above what the sellers paid for them. More than 1,700 people have viewed a Hernandez jersey listed by Ben Kent, a Pats fan from Virginia Beach. The bidding is up to $227. He paid $50 for it. The question is: Who is buying the jerseys? And why? Lamothe said the person who bought his jersey told him just two things: He had overpaid, and he did not want his wife to know what he had done.